1. NPOESS PREPARATORY PROJECT VALIDATION PLANS FOR THE OZONE MAPPING AND PROFILER SUITE (OMPS) IGARSS, Vancouver BC, July 29, 2011 L. Flynn, D. Rault, G. Jaross, I. Petropavlovskikh, C. Long, J. Hornstein, E. Beach, W. Yu, J. Niu, D. Swales Paper: 3270 Session: FR2.T07: Aerosols and Atmospheric Chemistry III Location: Room 13 Time: Friday, July 29, 10:20 - 12:00

6. Ozone Calibration and Validation Team Members’ Roles & Responsibilities Area Name Organization Funding Agency Task Validation and Comparisons L. Flynn NOAA/NESDIS JPSS Internal and Satellites Ground-based Data I. Petropav-lovskikh NOAA/ESRL JPSS Dobson and Umkehr Applications C. Long NOAA/NCEP JPSS/JCSDA Assimilation Limb D. Rault NASA LaRC NASA NPP R&D Climate R. McPeters L. Flynn NASA GSFC NOAA/NESDIS NASA NOAA/NCDC CDR & Reprocessing Instrument S. Janz B. Sen G. Jaross X. Wu NASA GSFC NGAS NASA (SSAI) NOAA/NESDIS NASA/JPSS JPSS NASA/JPSS JPSS RDR and SDR

9. Internal Instrument Measurements Even before the instrument is open to external light, the SDR Team will be making measurements of Dark Current and of Linearity (by using an on-board LED and variable integration times). We will also be able to investigate Charged Particle effects in the South Atlantic Anomaly. These are of concern for the OMPS Nadir Profiler. The Figure to the Right shows SAA contamination of OMI measurements and the results of a nearest-neighbor filtering program. Outliers are identified by spectral, spatial, and temporal comparisons to nearest neighbors. Shifted up 1*10^9 With outliers removed

10. First Solar Measurements The first set of solar diffuser measurements will be used to check the Irradiance Calibration, Wavelength Scale, Goniometry Models, Signal-to-Noise Ratios, Flat Fielding/Pixel Response Uniformity, and Bandpass. The top figure on the right shows two proxy OMPS NP Spectra and the relative difference between them. The lower figure shows the changes in a set of solar diffuser measurements for NOAA-17 SBUV/2 as the solar angle varies from a reference elevation angle of 4 degrees . Since solar variations over the ten-minute measurement period are negligible, these changes are due to inaccurate goniometric corrections. Solar Elevation Angle, Degrees 400 nm 302 nm 258 nm 200 nm 3% Lower Figure from M. DeLand & L-K Huang of SSAI, Lanham MD. Wavelength, nm 4% 310 260

11. Empirical Orthogonal Function Analysis of the Covariance Matrix for One Orbit of GOME-2 Earth-view spectra 320-330 nm Coefficients Ozone Absorption Wavelength Scale Ring Effects Eigenvectors Wavelength in nm Normalized EOF Measurement Number along Orbit EOF Coefficient

12. * NOAA-19 SBUV/2 + NOAA-18 SBUV/2 No new Solar adjustments were used for NOAA-19 . NOAA-19 IBSL One Day

13. One day of data can be used to compare total ozone maps between two satellite instruments or with an assimilation product. The top two figures to the left give an example for EOS Aura OMI versus the Global Forecast System maps for a day. One day of OMPS Nadir Profiler measurements can be used to characterize stray light. The results for a simple one-channel source for a day of SBUV/2 data is shown in the figure on the lower left, that is, measurements with stray light over an orbit of position mode data for 280.7 nm for the SBUV/2 are compared to a model using scaled variations of the Photometer measurements at 380 nm . The solid line is the 280.7 nm data and the dots are the model. The final figure in the lower right compares one day of zonal mean ozone profile estimates for NOAA-17 and NOAA-16 SBUV/2 with those from EOS Aura MLS . Latitude, Degrees N 5% Ozone in the layer from 30 hPa to 10 hPa Latitude, Degrees N 280.7 nm Radiances One Day Layer Ozone, DU with stray light without stray light 25%

14. EAST WEST GOME-2 Version 8 331-nm Effective Reflectivity for a box in the Equatorial Pacific for eight days plotted versus satellite viewing angle positions . The unadjusted values in the top plot reach a minimum of 8% (higher than expected for the open ocean) for the Nadir scan position. A single calibration adjustment lowers this value to 4% and also flattens out the scan dependence for West-viewing positions. The East-viewing results are not as good due to sun glint. |Lat|<5 Lon<-100 Forward Scan Position 4% Effective Reflectivity, % Effective Reflectivity, %

15. Comparison SAGE III Limb Scatter versus SAGE II Occultation Validation of the OMPS Limb Profiler ozone profiles will prove challenging as measurements with similar vertical resolution will be in short supply. This slides demonstrates the use of SAGE II occultation measurements to validate the SAGE III Limb Scatter retrievals using coincident measurements over a two-week period.

16. The figure on the right compares monthly zonal means (for February 2010) for the NOAA -17 , 18 and 19 SBUV/2 profile retrievals. The lines show the differences between the retrieved profiles and the A Priori profiles for the Equatorial Zone (20S to 20N) as a function of atmospheric pressure. The figure below tracks the average initial measurement residuals for the NOAA-16, 17 and 18 SBUV/2 instruments for the 292-nm channel. The curves connect the daily Equatorial Zonal Mean values for each instrument. The shared variations are due to real geophysical ozone changes from day to day . The divergent values are caused by differences in each instruments viewing conditions or calibration. The NOAA-16 has increasingly poorer viewing conditions as the record progresses. 5% Six Months Monthly Zonal Mean Profile Differences for SBUV/2 Monthly Differences and Long-Term Monitoring Layer Differences, % Pressure, hPA See http://www.star.nesdis.noaa.gov/smcd/spb/icvs/proSBUV2operational.php 5%

17. Total Ozone (Best and Profile) Comparisons Reprocessed NOAA SBUV/2 and WOUDC Dobson 1% YEAR The figure to the left shows a time series of comparisons of match-up overpass total ozone values from SBUV/2 instruments with a collection of ground-based Dobson Stations . Each point is a monthly average percent difference for all of the comparisons . A station is included if it has at least five match-ups for a month. The figure below is a check of the internal consistency of the total ozone estimates made for two different wavelength pairs for the SBUV/2 instruments, called the B-pair and D-pair. The D-pair estimates have much less sensitivity to time dependent calibration errors , but are only accurate at low solar zenith angles and low ozone column amounts. Notice the drift in the NOAA-18 SBUV/2 results. 2% Six Months YEAR 2 years

18. YEAR Seasonal Variations of Layer Ozone over Lauder, New Zealand (45S, 170E) Microwave SBUV/2 The figure to the right shows a comparison between ozone profile layer estimates from a ground-based microwave and match-up SBUV/2 overpass data. The dots are individual daily measurements and the curves are a seven-day moving average . The data are from a single year. The figure below shows a multi-year comparison (2002 to 2007) between the ground-based Umkehr measurements for Boulder CO and the NOAA-17 SBUV/2 overpass values. The individual points are deseasonalized anomalies for the layer from 6.3 hPa to 4 hPa. 2003 2004 2005 2006 2007 2008 Ozone Anomaly, %

20. Backup